Ransomware Research
NM4 Ransomware
NM4 is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on April 1, 2017, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: NMoreira4.
Quick Facts
- Ransomware Family
- NM4
- First Seen
- April 1, 2017
- Known Aliases
- NMoreira4
How NM4 Ransomware Works
File Encryption Patterns
NM4 modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..NM4..NMCRYPT..NMoreiraRansom Note and Payment Demands
After encrypting files, NM4 displays ransom notes demanding payment for file recovery:
Recovers your files.htmlRansom message:
notes/Recovers your files.html
Note locations:
EveryFolderYOUR_DRIVE_HAS_BEEN_ENCRYPTED.TXTRansom message:
notes/YOUR_DRIVE_HAS_BEEN_ENCRYPTED.TXT
Note locations:
RootDiscsTechnical Indicators
Associated Executable Files
The following executable files are associated with NM4 ransomware:
12.exefile.exeR NM4 NMoreira 4 ransomwaresvchost.exescvhost.exeout.exefinish_work.exe
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About This Analysis
This NM4 ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery solutions, helping organizations defend against and recover from ransomware attacks like NM4.
Last updated: July 30, 2025